Happy Endings Are All Alike by Sandra Scoppettone 1978, Paperback
It's their last summer before college, and Jaret and Peggy have fallen deeply in love. They exchange love letters, have pet names, and spend hours alone in their special clearing in the woods. For once, life is perfect. But Jaret and Peggy live in Gardener's Point, a small town a hundred miles from New York City, and a place where girls only date boys. In Gardener's Point, being different isn't easy-but nothing could prepare them for the danger that lies ahead.